Pneumatic tire.



G. J AGOBS.

PNEUMATIG TIRE. A P 111111111111111111111111 a.

hmm/l UNITED sTA'rEs rArENr oEEieE.

GRANT JACOBS, OF DES MOINES, IOWA.

PNEUMATIC TIRE.

Specification of Letters Patent..

Patented May 1s, 1909.

Application filed March 13, 1908. Serial No. 420,941.

To all whom it may concern:l

Be it known that l, Gimx'r J.\`ooiss, a citiconnected with the sides ofthe outer casing,

so that 'when the 'tread portion becomes worn. a new tread portioiimaybe substituted for the worn one, thus etfecting a greateconomy in theuseof pneumatic tires.

.l tui-ther object is to provide a tire of this kind, with means wherebywear upoin the side members is eliminated to .thereby lengthen the lifeof said side members.

further object is to provide a pneumatic tire ot' this'kind, in whichthe tires are prevented from' skidding.

My invention consists in the construction, arrangement and combinationof the various parts of the device, whereby the objects contemplated areattained, as hereinafter more fully .set forth, pointed out in my claimand illustrated in the accompanying drawings, in which- Figure 1 shows atransverse sectional view through a tire embodying my invention, andconnected to a vehicle rim. Fig. shows a siniilar view of a slight-lymodified form, andwFig. 3 shows a side elevation of a portion of a tireembodying my invention, and `l:onnected to a vehicle rim.

. Referring to the accompanying drawings, l have used the referencenumeral 10 to indicate that portion of the vehicle rim shown, and 11 toindicate the inner tube ofthe pneumatic tire'. In Fig. 1 vof thedrawings, the

outer casing ot' the tire is shown to be formed of three members,comprisingtwo sides, and a tread portion. The sides are indicated by thereference numeral 12, and are detachably connected with the rim byhaving an annular rib 13 formed thereon, to.

enter an annular groove formed in the rim member 14. This means forconnecting pneumatic tires to rims does not forni part of my presentinvention. The side members are further connected to the rim by meansof' the headed bolts, such as are indicated by the numeral 15 in Fig. 1.The edges of said side portions-12 that are adjacent to the treadportion, are beveled or inclined at 16,

and provided with a shoulder 1t.

'lhe tread portion of' the tire comprises a :body member18'-pre't`erably. of resilient material such as rubber. This treadportion is substantially flat on its outer surface, and is preferablyprovided with integra-l lugs to form a rough surface tread. The sideedges ot'- the tread-portion are shaped to tit against the shoulders 1Tand the beveled edges 1G of the side members, as clearly shown in Fig.1.

l provide for coimeeting the tread portion with the. side portions bymeans of two metal rims 19 extended around the sides of the tireadjacent to the periphery of the tread portion. These metal rims servethe double function otproviding means to.ie ceive the rods 2() .whichpass through the metal i'iins, through the` sides 1:2, and through thetread portion 1S. Said metal rims also serve to protect the sides 19.from wear. In this` connection, it is to be understood that on smoothand level roads, all of lhc-wear upon the pneumatic tire isupon thetread portion, 'and wear is thrown upon the side portions only when thetire is traveling through ruts or grooves which are slightly narrowerthan the tire, then con- .siderablc wear is thrown upon the sideportions, and with the ordinary style. of round tire; the wear thusoccasioned quickly destroys the side portions. By'the use of the metalrims 19, the sides of a rut or groove in a road surface will be eut awayto the same width as the body of the tire, so that the sides of the.tire. will not rub against the sides ot' said rut or groove.'lt`urtheimore, the Hat tread portion of the tire, assisted by the metalrims 19, will tend to prevent skidding of the tires, because said metalrims will cut into a smooth, wet, or slippery road surfaeesufticientlyto prevent lateral movement of the tire on the road way.-

ln the modilied form shown in Fig. 2, the two side portions 12 areunited, and connected to the rim by cement, or in any ordinary way. Thenovel features of myinvention in the form shown in Fig. 2 ai'e exactlythe same as in the form shown in Fig. 1.

In practical use, and assuming that the tire is being used oncomparatively smooth, level roads, then obviously, all of the wear uponthe tire is thrown upon thetread portion. When the tread portion becomesworn out, the operator need only vremove the bolts 20 and then removetheworn tread.

portieri` after which a new tread portion' may be substituted for the.Worn one, whereupon' the tire will be again ready for This may be doneatmuch iess expense than ti'orr with new sides. Furthermore, the

metal rims at the edges of the tire serve the double function ofpreventing skdding, and

ofcutting out the sides of ruts or grooves'` in a roa way, to preventWear upon the side portions of the tire.

I claim as my invention: v p

A pneumatic, tire, comprising an inner tube, an outer tube having twosides with their outer edges spaced apart and formed with shoulders atthe periphery thereof, a tread memberhavinff a substantiallyat tace andbeing designed ,to t between the edges of the. said sides and to restagainst -vthfepouter portions of said shoulders, the saliat treadportion being. of substantiall the Same Width as thev greatest width oAthe tire atv .-Y

the central portion of thesides, and two ruw-y metal rims arrangedimposition overla the side edges of the tire and, thetrea p0rtion at the'point where they engage each other and also being pro fied mth sharpcned outer' edges substanpzialljT as and for the purposes stated.

' Des Moines, Iowa, March 3; 1908;- v

GRANT Jacoijsi Vtnesses:

RALPH URWIG, S. F. CHRISTY.

